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Home >> GMC >> 2011 >> Acadia SL, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> DTC P1574 >> Circuit/System Verification

Circuit/System Verification

Ignition ON, observe the BPP Signal parameter in the ECM while applying and releasing the brake pedal. The parameter should change between Applied and Released when changing between the selected states. All brake lights should turn ON and OFF accordingly.

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